What is the status of knowledge of the toxic effect of lead on identifiable groups in the population?
D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007855:Lead Poisoning; D008297:Male; D009784:Occupational Diseases; D011247:Pregnancy